Text and Data Mining valid from 2019-04-08
Received: 8 February 2019
Accepted: 2 April 2019
First Online: 8 April 2019
Compliance with ethical standards
: All authors state that they have no conflict of interest that might potentially bias they work.
: The study was approved by the Sechenov University (Moscow, Russia) Institutional Review Board.
: Informed consent was obtained from all individual participants included in the study.